The heat capacity of copper has been measured below 4?2 �K with a calorimeter using a mechanical heat switch. The effects of changes in the chemical and physical state of the copper have been investigated with a view to understanding discrepancies between the results of previous workers.

Aust. J. Phys., 1979, 32, 641-6 The temperature dependence of the carrier scattering rate in copper has been determined from magnetoacoustic data. For both the (100) central belly orbit and the (110) 'dogs-bone' orbit a T3 dependence is observed, the coefficients of the corresponding term in the scattering rate agreeing well with those obtained from radio frequency size-effect experiments. Previously reported discrepancies between the results obtained by the two methods are discussed and tentatively resolved.